Interference Fragmentation Functions and Spin Asymmetries

A new class of fragmentation functions, arising from the interference of different hadron production channels, is analyzed in detail. Their symmetry properties with respect to naive time-reversal transformations allow for the exploration of finalstate interactions occurring during and after the hadronization. Their symmetry properties with respect to chiral transformations allow building spin asymmetries where the quark transversity distribution can be factorized out at leading twist. Explicit calculations will be shown for the interference fragmentation functions arising from final-state interactions of two pions detected in the same current jet for the case of semi-inclusive Deep-Inelastic Scattering (DIS).